Double envelop



John .Hf Win Patented Oct. 26,

P. A. MIO/BERG.

DOUBLE ENVELOP.

APPucATxoN HLED FEB.15, 19m

PAUL A. MOBERG, F CHICAGO, ILLINOIS.

DOUBLE ENVEL OP,

Speccation of Letters Patent.

Appiication inea February i5, 191s. serial No. 217,447.

To all fio/1,0m it may concerny tion substantially rectangular in form and Be itknown that I, PAUL MOBERG, a \divided by a crease line 10 into a front wall citizen of the United States, residing at Chicago, in the county of Cook and. btate of Illinois, have invented a certain new and useful Double Envelop, of which the following is a specification.

rlihe present invention relates to envelops, and more particularly to that class-known as double or return envelops.

The object of this invention is to provide an envelop which is forniedwith two cornn partments capableof being separated without destroying either compartment and each having a flap'with one of the flaps adapted to secure the compartments together without destroying the flap of the other compartment; and to provide an envelop einbodying these characteristics and which may be formed from a single blank and re quiring but relatively few folds or flaps.

Various other objects and advantages of this invention will be in part disclosed, and Y in part become apparent, from the following detailed description of the present preferred embodiment, the same being illustrated in the accompanying drawing, wherein:

Figure 1 is a plan view of a blank con- Structed according to the present invention and from which a double envelopv embody ling the features of this invention may be formed.

Fig. 2 is a rear side elevation of the blank having its several flaps folded to form the two compartments and with one compartment 'closed and the other left open, the dotted lines showing the'positions of the folded -flaps.

Fig. 3 is a face view of the envelop.

Fig. 4 is a longitudinal section taken through the envelop substantially on the plane indicated by the line 4 4 in Fig; 2, showing both flaps in partly open position.

Fig. 5 is a similar view taken substantially on the plane indicated by the line 5 5 in Fig. 2, showing a section through one end of the double envelop.

Fig. 6 is an enlarged transverse section through the envelop folded and sealed.

Fig. 7 is a perspective view of the coinpleted envelop, on a reduced scale, closed.

In the present embodiment of this invention, as illustrated in the accompanying drawing, the envelop is formed from a blank which is provided with a body por 11 at vone end of the blank .which will be hereinafter referred to as the upper end, and a rear wall 12 at the lower end of the blank. Opposite the front wall section 11,

the blank is providedat its lateral edges with'back wall ,flaps13 and 14 adapted to be folded over against the front wall 11 with their free ends overlapping, as shown in Fig. 2, and provided at their lower marginal edges with-attaching strips 15 integral with the. blank and adapted to be folded over against the inner sides of the flaps and to be secured b an adhesive or the like to the bottom of t e front wall 11.

Thestrips 15 form the bottom edge of an upper compartment which is adapted to be closed at its top by al main flap 16 supplied with an adhesive upon its inner surface for closing the double envelop after the contents have been placed therein.

The lower end of the blank is provided,

opposite the rear wall 12 with side flaps 17 which are integral with the lateral edge portions of the blank and are adapted to be folded over upon the wall 12 at the same side of the blank at which the flaps 13 and 14 are folded over. The strips 15 of the upper flaps are stamped partly from the lower flaps 17 as shown in Fig. 1 and extend only part way into the lower flaps to provide projections 18 at the upper edges of the flaps 17 adapted to insure the closing ofthe upper corners of a lower compartment which is formed between the flaps 17 and the rear wall 12. Y A

The blank is provided at its lower end with a front wall flap 19 adapted to be folded upward against the rear wall 12 over the side flaps 17 and secured thereto'by an adhesive or the like for completing' the lower compartment. This front wall Hap 19 carries a sealing flap 2O which is adapted to be initially folded back against the rear wall 19 at the exterior side of the latter, and which is provided with an adhesive upon its outer face. for securing the flap 20 to the rear wall 12 when the latter is separated along the crease line 10 from the upper part 11 of the blank.

lVhen the envelop blank is folded to forni the upper and lower compartments as above outlined, it presents the form shown in Figs. 2 to 5 inclusive. Mailing matter may be placed in either one or both of the coni- Patented Oct. 26, 1920.

partments and with an address placed upon the exterior face of the front wall 11 of the upper compartment, as shown in Fig, at one side of the double envelop, and the name and address of the sender may be placed upon the front wall 19 of the lower compartment and onvthe opposite side of the double envelop.

The lower compartment may be now swung the rear side of the upper compartment, 1n which position the lower edge portion of the lower compartment 1s placed against the upper edge portion of the upper compartment, and the flap 16 may be turned over and secured to the upturnedlower edge portion of the lower compartment to hold the compartments together as shown in Fig. 6. `When the envelop is so folded the front wall 19 of the lower compartment faces 1nwardly and the parts are securely retained in this position for transportation through the mails or the like.

lVhen'the folded envelop reaches its destination, the flap 16 may be torn open to free the tivo sections and admit access to both of them. For returning an answer to the sender of the envelop the upper part of the blank is severed from the lower part along the line 10, and the ap 2O of the lower compartment may then be folded over .the upper edge of the rear wall 12 and sealed against the exterior vface thereof. `This lower section thus provides anindependent envelop and may be remailed as such, the address of the original sender being placed upon the exterior face of the front wall 19.

The shoulders 18 of the side flaps-17 efup upon the crease line 1O-againstl fectually close the upper corners of the lower compartment and `render it difficult for the introduction of an implement for fraudulently releasing the sealing flap 20. It may also be noted that the upper edges of the side flaps 13 and 14 of the upper compartment are of the full height of the front wall 11 for effectually closing the space beneath the sealing ila-p 16, and that the outer endv portions of the flaps 13 and 111 are reduced in width to facilitate opening` of the upper compartment.

It is of course understood that the fea' tures of this invention may be embodied in various other forms, the changes and modifications being restricted only by the scope of the following claim.

Wiat is claimed is: y

A double envelop comprising a single blank having a main body portion divided transversely into three sections and with one end section equipped with lateral fiaps adapted to be folded over said end section and secured to each other, said'end section having a closure flap at its free edge and said flaps each having a closure strip at its bottom. edge, the intermediate section of the blank having a second pair of lateral flaps adapted to be folded inwardly 'against the intermediate section and the other end sec tion being adapted to be folded over upon said second pair of flaps, said second end section having a sealing flap at its free edge adapted to be folded between the end sections when the envelops are turned over one upon the other and adapted to seal the adjacent envelop when the envelops are severed one from the other.

PAUL A. MOBERG. 

